Invite is a social media site in the world of Watch Dogs 2. The name is often stylized as "!NViTE".
Invite was first mentioned in the Dedsec Infiltration Mission video footage from E3. They are apparently collecting information on everyone in San Francisco (and possibly the world), and are implied to have some hand in rigging the election of Mark Thruss.
Invite appears in Watch Dogs 2.
Behind the scenes
Invite, like many other companies in the game, is a very similar reproduction of the real world social media site Facebook.